The role of hydration in protein stability: Comparison of the cold and heat unfolded states of Yfh1

Miquel Adrover, Gabriel Martorell, Stephen R. Martin, Dunja Urosev, Petr V. Konarev, Dmitri I. Svergun, Xavier Daura, Pierandrea Temussi, Annalisa Pastore

Research output: Contribution to journalArticleResearchpeer-review

35 Citations (Scopus)

Abstract

Protein unfolding occurs at both low and high temperatures, although in most cases, only the high-temperature transition can be experimentally studied. A pressing question is how much the low- and high-temperature denatured states, although thermodynamically equivalent, are structurally and kinetically similar. We have combined experimental and computational approaches to compare the high- and low-temperature unfolded states of Yfh1, a natural protein that, at physiologic pH, undergoes cold and heat denaturation around 0 °C and 40 °C without the help of ad hoc destabilization. We observe that the two denatured states have similar but not identical residual secondary structures, different kinetics and compactness and a remarkably different degree of hydration. We use molecular dynamics simulations to rationalize the role of solvation and its effect on protein stability. © 2012 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)413-424
JournalJournal of Molecular Biology
Volume417
DOIs
Publication statusPublished - 13 Apr 2012

Keywords

  • NMR
  • SAXS
  • cold denaturation
  • frataxin
  • protein stability

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